US Bio effects of diagnostic US are discussed at (painful) length in undergraduate radiography training here in New Zealand. We are fairly well aligned with the UK in our training pathway but in my (limited) experience echo techs don’t seem to come from a radiography background while ultrasound ones do. Could be a local situation though. Broadly, the priciples seem to be ALARM and perhaps don’t do ‘souvenir’ scanning of foetuses. I wonder if anywhere follows that.